From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7748CC33CB2 for ; Wed, 29 Jan 2020 05:18:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5086A20CC7 for ; Wed, 29 Jan 2020 05:18:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726869AbgA2FSU (ORCPT ); Wed, 29 Jan 2020 00:18:20 -0500 Received: from ozlabs.org ([203.11.71.1]:33283 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726251AbgA2FR3 (ORCPT ); Wed, 29 Jan 2020 00:17:29 -0500 Received: by ozlabs.org (Postfix, from userid 1034) id 486sDm0x6Cz9sRl; Wed, 29 Jan 2020 16:17:28 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 0f9aee0cb9da7db7d96f63cfa2dc5e4f1bffeb87 In-Reply-To: <0728849e826ba16f1fbd6fa7f5c6cc87bd64e097.1577087627.git.christophe.leroy@c-s.fr> To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] powerpc/mm: don't log user reads to 0xffffffff Message-Id: <486sDm0x6Cz9sRl@ozlabs.org> Date: Wed, 29 Jan 2020 16:17:28 +1100 (AEDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2019-12-23 at 07:54:22 UTC, Christophe Leroy wrote: > Running vdsotest leaves many times the following log: > > [ 79.629901] vdsotest[396]: User access of kernel address (ffffffff) - exploit attempt? (uid: 0) > > A pointer set to (-1) is likely a programming error similar to > a NULL pointer and is not worth logging as an exploit attempt. > > Don't log user accesses to 0xffffffff. > > Signed-off-by: Christophe Leroy Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/0f9aee0cb9da7db7d96f63cfa2dc5e4f1bffeb87 cheers